プラズマアーク溶解炉を用いた鉱石の溶融還元によるステンレス粗鋼の製造

概要

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Smelting reduction of chromium ore with coke by using a plasma jet furnace was investigated to produce 18%-Cr steels. The operation of the plasma furnace was controllable and stable for the reduction of chromium ore. Chromium ores were successfully reduced to produce 18%-Cr steels (1.0∿3.0%C, 0.014∿0.019%P, 0.05∿0.09%S) with 92∿95% of chromium yield where the excess iron was supplied as steel scrap. The thermal energy released from the transfer-type plasma jet was effectively transferred to reactants and significantly enhanced the chemical reaction rate. It was observed that sulfur in ore and coke were substantially removed to gas phase with the proportion of 40∿50% out of the total input, presumably because CO gas evolving on the reduction carried away sulfur bearing gases from the system.
社団法人日本鉄鋼協会の論文
1983-03-01